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framps / raspiBackup

Create and keep multiple backup versions of your running Raspberries
https://raspibackup.linux-tips-and-tricks.de
GNU General Public License v3.0
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Add an option to disable linking of rsync backups to previous backups to force a full backup #778

Closed framps closed 1 month ago

framps commented 2 months ago

Unfortunately binNMU packages may not be updated in a backup with rsync because they get the same timestamp and size during package build and therefore rsync doesn't detect a file change and doesn't update the file in the backup.

In particular when an OS update was made the first backup of this updated system should be a full update to catch the issue with the binNMU packages.

As of now there is no way to get raspiBackup to create a new full rsync backup even a previous backup exists which will catch this issue.

A workaround to this is to define option

DEFAULT_RSYNC_BACKUP_ADDITIONAL_OPTIONS="-c"

in the config file. Then rsync will create a checksum for every file and detect file changes even the date and size was not changed. But this unfortunately has a serious performance impact.

gchriz commented 2 months ago

Hint: "binLMU packages" should read "binNMU ..."

framps commented 2 months ago

Thx. Typo fixed.

framps commented 2 months ago

I got a proposal to handle this issue in a more elegant way:

Use a different naming scheme of the backup directories which includes the os version. Use raspberrypi@debian12-rsync-backup-20240416-094106 instead of raspberrypi-rsync-backup-20240416-094106

Then every time a new OS version is saved a new backup directory is used and thus a new full backup is created.

It's a low hanging fruit to add another option. A change of the backup directory name requires much more effort.

I think I will add a new option first and change the backup directory name in a later release.

framps commented 1 month ago

This issue is obsolete and will be handled by #791